Peak Inspiratory and Peak Inspiratory and Expiratory Flow Meter Expiratory Flow Meter Team: Team: Andrew Eley, Sarah Offutt, Darshan Andrew Eley, Sarah Offutt, Darshan Patel, Patel, Eric Bader Eric Bader BME 200/300 BME 200/300 December 2, 2005 December 2, 2005
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Peak Inspiratory and Expiratory Flow Meter Team: Andrew Eley, Sarah Offutt, Darshan Patel, Eric Bader BME 200/300 December 2, 2005.
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Peak Inspiratory and Peak Inspiratory and Expiratory Flow Meter Expiratory Flow Meter
Team:Team:
Andrew Eley, Sarah Offutt, Darshan Patel,Andrew Eley, Sarah Offutt, Darshan Patel,
Eric BaderEric Bader
BME 200/300BME 200/300
December 2, 2005December 2, 2005
Client:Client:Christopher G. Green, MDChristopher G. Green, MD
Dept. of Biomedical EngineeringDept. of Biomedical EngineeringUniversity of WisconsinUniversity of Wisconsin
AbstractAbstract A device for measuring both peak inspiratory A device for measuring both peak inspiratory
and expiratory air flow in a single device is and expiratory air flow in a single device is desired. It will help prevent the misdiagnosis desired. It will help prevent the misdiagnosis of vocal chord dysfunction as asthma. A of vocal chord dysfunction as asthma. A prototype was built to measure these air prototype was built to measure these air flows. The design is a clear plastic tube that flows. The design is a clear plastic tube that contains a plunger which pushes the indicator contains a plunger which pushes the indicator arrows depending on the air flow. The device arrows depending on the air flow. The device was calibrated and tested with a rotameter. was calibrated and tested with a rotameter. Future work includes manufacturing of better Future work includes manufacturing of better parts, obtaining a patent, and marketing for parts, obtaining a patent, and marketing for use. use.
Problem StatementProblem Statement The goal of this project was to create a The goal of this project was to create a
peak inspiratory and expiratory flow meter peak inspiratory and expiratory flow meter in a single device. Peak expiratory flow in a single device. Peak expiratory flow meters are used to monitor asthma and meters are used to monitor asthma and measure flows of about 700 liters per measure flows of about 700 liters per minute. Vocal chord dysfunction, which minute. Vocal chord dysfunction, which causes stenosis of air passages during causes stenosis of air passages during inspiration, is often misdiagnosed as inspiration, is often misdiagnosed as asthma. Having a peak inspiratory and asthma. Having a peak inspiratory and expiratory flow meter in one device can expiratory flow meter in one device can help prevent a misdiagnosis of a patient’s help prevent a misdiagnosis of a patient’s condition. condition.
BackgroundBackground
Asthma Asthma – Exhaling, air restrictions in Exhaling, air restrictions in
the lower airwaysthe lower airways– Caused by external triggersCaused by external triggers– Treated with medicationsTreated with medications
Vocal Chord DysfunctionVocal Chord Dysfunction– Inhaling, air restrictions Inhaling, air restrictions
caused by vocal chordscaused by vocal chords– Possible causes, exercise, Possible causes, exercise,
nervousnessnervousness– Treated with speech Treated with speech
– Springs balance the Springs balance the force on the plunger force on the plunger caused by the caused by the pressure differencepressure difference
– Scale on the side for Scale on the side for reading reading measurementmeasurement
Testing and CalibrationTesting and Calibration
Used a rotameter Used a rotameter to calibrate and to calibrate and test the inspiratory test the inspiratory and expiratory and expiratory flows.flows.
Replacement with a new set of springs Replacement with a new set of springs to obtain a sufficient range with a linear to obtain a sufficient range with a linear relationship.relationship.
Add breathing zone indicators to show Add breathing zone indicators to show acceptable values for peak inspiratory acceptable values for peak inspiratory and expiratory flow.and expiratory flow.
Future Work Cont.Future Work Cont.
Calibrate device with a more accurate Calibrate device with a more accurate method and with multiple trials.method and with multiple trials.– Rotameter proved to be insufficient.Rotameter proved to be insufficient.
Possibly apply for a patent and find a Possibly apply for a patent and find a company to manufacture this device company to manufacture this device for commercial use.for commercial use.
ReferencesReferences Allen, James MD. (2002). Allen, James MD. (2002). Vocal Cord DysfunctionVocal Cord Dysfunction. Retrieved . Retrieved
October October 2, 2005, from2, 2005, fromhttp://home.columbus.rr.com/allen/http://home.columbus.rr.com/allen/
American Lung Association. (2005, July). American Lung Association. (2005, July). Asthma in Adults Asthma in Adults Fact Fact SheetSheet. Retrieved October 2, 2005, from. Retrieved October 2, 2005, from
Framingham School. (2005, June). Framingham School. (2005, June). Framingham School Health Framingham School Health Services: Asthma. Services: Asthma. Retrieved October 2, 2005. fromRetrieved October 2, 2005. fromhttp://www.framingham.k12.ma.us/schoolhealth/http://www.framingham.k12.ma.us/schoolhealth/